food = (1,2,3,4,5)
for delicious_food in food:
    print(delicious_food)
    food[0]=6
for delicious_food in food:
    print(delicious_food)
food = (1,2,3,7,8)
print("\n",'修改后:')
for delicious_food in food:
    print(delicious_food)